IsAllowedDate.ps1
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param( # Parameter help description [Parameter(Mandatory=$true)] [Datetime] $Date, [Parameter()] [Datetime] $BaseDate = (Get-Date) ) $currentQuarter = Get-Date -year $BaseDate.Year -Month ([Math]::Ceiling($BaseDate.Month /3) * 3 - 2) -Day 1 $currentYear = Get-Date -Year $BaseDate.Year -Month 1 -Day 1 $allowedDates = @( $BaseDate, $BaseDate.AddDays(-1), $BaseDate.AddDays(-2), $BaseDate.AddDays(-3), $BaseDate.AddDays(-4), $BaseDate.AddDays(-5), $BaseDate.AddDays(-6), $currentQuarter, $currentQuarter.AddMonths(-3), $currentQuarter.AddMonths(-6), $currentQuarter.AddMonths(-9) ) if ($Date.Day -eq 1 -and $Date.Month -eq 1) { return $true } ($allowedDates | Where-Object { $Date.Day -eq $_.Day -and $Date.Month -eq $_.Month -and $Date.Year -eq $_.Year }).Count -gt 0 |